docs: def save_at(self, path, writer=None):
          """
          Save this corpus at the given path. If the path differs from the current path set, the path
          gets updated.
  
          Parameters:
              path (str): Path to save the data set to.
              writer (str, CorpusWriter): The writer or the name of the reader to use.
          """
  
          if writer is None:
              from . import io
              writer = io.DefaultWriter()
          elif type(writer) == str:
              # If a loader is given as string, try to create such a loader.
              from . import io
              writer = io.create_writer_of_type(writer)
  
          writer.save(self, path)
  
          self.path = path